What are the two advantages of desert plants due to the modification of leaves into Thorns

Spines are modified leaves which have less surface area. Plants lose water through their leaves. In deserts, that is something that plants should avoid, so that they can store water. Thus, spines lose less water and are more advantageous in dry climates.

Explanation:

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≅200-130 milions years ago pangea splited in 2 continents

well we can't tell you because we cant see the time give a screen shot or something.